Development of photochromic device with magnetron sputtered titanium dioxide and tungsten trioxide films
| Autor: | Rabin Basnet, Wolfgang Graf, Shankar Bogati, Andreas Georg |
|---|---|
| Přispěvatelé: | Publica |
| Rok vydání: | 2017 |
| Předmět: |
Thermische Anlagen und Gebäudetechnik
Materials science Solarthermie 02 engineering and technology Electrolyte 010402 general chemistry Photochemistry Electrochromic devices 01 natural sciences law.invention chemistry.chemical_compound Sputtering law Solar cell photochromic Triiodide photoelectrochromic electrochromic Renewable Energy Sustainability and the Environment business.industry 021001 nanoscience & nanotechnology Tungsten trioxide 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Electrochromism Titanium dioxide Optoelectronics Materialforschung und Optik 0210 nano-technology business |
| Zdroj: | Solar Energy Materials and Solar Cells. 166:204-211 |
| ISSN: | 0927-0248 |
| DOI: | 10.1016/j.solmat.2017.03.020 |
| Popis: | A photochromic (PC) device comprising an electrochromic film (WO 3 ) together with a photoactive film (usually, dye sensitized TiO 2 ) coated on glass and a redox electrolyte (e.g., iodide/triiodide together with lithium salt) reduces the optical transmission under solar illumination and bleaches, again, in dark or at low intensity of light. This work reports, for first time, on an application of sputter coated TiO 2 and WO 3 films for this type of PC devices. The applicability of TiO 2 and WO 3 films in PC device is individually investigated in dye solar cells and electrochromic cells, respectively. A dye solar cell with 180 nm TiO 2 was shown to be sufficient for the charge generation for electrochromic coloration of the WO 3 . The compatibility of WO 3 and redox electrolyte was studied in electrochromic devices by considering their redox potentials. The bleaching of the PC device has to be adjusted by the so called “loss current”. To address this, a thin catalytic layer of platinum (Pt) is deposited in between the photoactive and electrochromic layers. The optimized PC device exhibits a visual (solar) transmission modulation from 74 (63) down to 30% (20%) in 40 min under 1.5 A.M. illumination, and the bleaching is regained in 45 min in dark. |
| Databáze: | OpenAIRE |
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